Solar cells are made of
A.Silica
B.Steel
C.Sulphur
D.Antimony
E.Phosphorous
Category: Mechanical Engineering Mcqs
When a normal atom loses an electron, the atom
A.Becomes a positive ion
B.Becomes a negative ion
C.Becomes a electrically neutral
D.Is then free to move about
E.None of the above
If the two specific heats of a gas are 0.237 and 0.169 respectively, the volume of 3 kg of air at 27?C under a pressure of 3 ata would be
A.0.204 cu-m
B.1 cu-m
C.1.5 cu-m
D.1.74 cu-m
E.2.5 cu-m
Spot facing is
A.Localised machining of a component
B.Machining of a spot to fit other parts
C.Mahining of spol on the surface of a part to furnish a flat bearing or the head of a holt or nut
D.A spot prepared on shaper or milling machine
E.None of above
Under force voltage analogy, viscous friction coefficient is not considered analogous to
A.Charge
B.Multual inductance
C.Capacitance
D.Resistance
E.Current
An expression for the hour angle ? is where ts is the solar time in hours
A.? = 15(ts-6)
B.? = 15(ts+6)
C.? = 15(ts-12)
D.? = 15(ts-12)
In triptane rating the non-knocking reference fuel is
A.leaded 2,3,3 trimethyl butane
B.isobutane, C4H10
C.butadiene C4H6
D.none of the above
Saving is defined as
A.Accounting difference between current income and consumption
B.Sum of savings made by the different factors
C.Excess of expenditure over available income
D.Amount set aside for meeting unforeseen expenditure
E.None of the above
In case of belt drives, the effect of centrifugal tension is
A.To reduce the driving power
B.To increase the driving power
C.Not appreciable on driving power
D.Dependent on other factors
E.None of the above
If the compressor of a refrigeration system is noisy, it shows that
A.Compressor drive coupling is loose
B.Lack of oil
C.Internal parts of compressor broken
D.Compressor or motor loose on base
E.Any of the above
